Video driver woes

This is weird? I have one destop computer with 2 seperate hd's. The
primary has XP home. The other I installed win98se. When I installed
win98, i made it my primary with Win98. Changed the necessary jumpers.
In fact, I just unplugged the XP drive with IDE cable. Naturally, after
installing win98, I had to reinstall some drivers...mainly the video
driver for win98, not xp. Initially it gave me the 16 bit, 640 x 460
screen..so as I had done in the past, reinstalled my monitor and
adapter. After reinstalling, I could not get back into windows upon
rebooting...it went into safe mode. I removed the driver, rebooted and
this time I got into windows normally. After trying numerous times, I
could never get that display resolution to change. I called my computer
vendor and he was absolutely useless. ..his remedy was to buy another
video driver or update it. It came with my system just 2 years ago,
custom made. NVidea does not OEM update drivers.They told me to see the
vendor.I didn't know that, but the vendor should of known. So my last
resort was to reverse the procedure as i did before and made my XP
driver the primary again, to see if I have the same problem with the
video driver. My resolution was still 1024 x 768 and useing ( highest )
32 bit. . So why won't this video card, under the chosen win98 driver,
change that resolution in win98?